William crighton



Patented Jan. 19, 1892.

W. GRIGHTON. SLIDING GATE VALVE.

(No Model.)

' Witnesses Mn 43% UNITED STATES PATENT OFFICE.

W'ILLIAM CRIGHTON, OF FORT \VAYNE, INDIANA, ASSIGNOR TO THE KERR- MURRAY MANUFACTURING COMPANY, OF SAME PLACE.

SLIDING GATE-VALVE.

SPECIFICATION forming part of Letters Patent No. 467,369, dated January 19, 1892.

7 Application filed March 28, 1890. Serial No. 3451755, (N0 model.)

To all whom it may 60771067711:

Be it known that 1, WILLIAM CRIGHTON, a citizen of the United States, residing at Fort lVayne, in the county of Allen and State of Indiana, have invented certain new and useful Improvements in Sliding Gate-Valves 5 and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to sliding gate-valves, and particularly to that class having two independent valve-disks and means for forcing such disks outward and holding them to their seats.

The object of the invention is to provide simple and effective means for supporting the valve-disks upon or in a lifting-nut and screwstem and to provide improved means for thrusting or forcing the disks outward from the lifting-nut to their seats; also, to provide for so hanging or supporting the valve-disks by central journals that such valves are free to rotate and to readily adjust themselves to their seats.

In carrying out my invention I provide short journals at the centers and backs of the valve-disks and fit over each of such journals a rectangular plate having a central opening and lateral inclined projections or wedgeshaped flanges and properly fitted in the sides of the hollow lifting-nut. I also fit within the hollow lifting-nut a compound Wedgeblock composed of a horizontal top plate having avertical central opening and two wedgeshaped end pieces, which pieces bear upon the wedgeshaped flanges of the rectangular plates fitted over the journals of the valvedisks, whereby the parts, when properly moved one upon the other at their inclined faces, will force the valve-disks to their seats.

I will first particularly describe my improved valve with reference to the accompanying drawings, and then define the matter constituting my invention in the claims.

In the accompanying drawings, Figure 1 represents a vertical longitudinal section of the valve-casing, valve-disks, and lifting-nut. Fig. 2 represents a transverse section through the valve-casing, showing one of the valvedisks in full. Figs. 3 and 4 represent, respectively, vertical sections taken at right angles to each other of the lifting-nut. Fig. 5 represents a front face view of one of the rectangular plates provided with lateral inclined wedge-shaped flanges. Fig.6 represents a vertical section thereof. Fig. 7 represents a side view of a compound wedgeblock constructed to bear upon the inclined lateral flanges of the plates shown in Figs. 5 and 6. Figs. 8, 0, and 10 represent, respectively, a transverse section, a plan view, and an end view thereof. p

The valve-casing A and pipe-section A are constructed in the usual manner, and such section A is provided internally with annular valve-seats h and externally with the flanges a. A housing or box B for the valvestem is mounted upon the valve-casing, and is provided at the top with a suitable stuffingbox b and gland in the usual manner. The internal screw-threaded hexagonal nut 11' is fitted in a suitable recess between the housing B and valve-case for the screw-threaded valve-stem to work in. The valve-stein O is provided at the top with hand-wheel c, and has cut on its lower portion right and left hand screw-threads, the upper right-hand screw-thread working through nut b and the lower left-hand screw-thread Working into the lifting-nut E. The lifting-nut E is made hollow, and is provided at the top with a screwthreaded openingefor the passage of the valvestem and at the'bottom with opening e for the passage of valve-stem and the retaining nut or collar 1. It is also provided with rectangular openings ff in its sides, as shown in Figs. 3 and 4, for inserting compound wedge-block H and for holding the rectangular plates G on each side. These rectangular plates are each provided with a central opening g, and at the outer edges with the vertically-inclined flanges g, as clearly shown in Figs. v5 and (5. These plates are of just the correct size and shape to fit within the rectangular openings ff in the lifting-nut, and by means of their round central openings they are fitted upon the short journals cl of the valve-disks.

The compound Wedge-block H is composed of the horizontal top plate h, having a vertical central opening for the passage of the screw-threaded valve-stem, and with the doubly-inclined or wedge-shaped end plates h, as olearlyshownin Figs. 7, 8, 9, and 10. As

IO shown in Figs. 1 and 2, the compound wedgeblo ck H is inserted within the hollow liftingnut E, so that the wedge-plates h will bear N upon the inclined flanges g of the rectangular trunnion-plates G. The valve-disks D- D are I 5 provided centrally at their backs with short journals d, and near the periphery with annular lips or rims cl on their inner faces for hearing against the seats a. Vertical and parallel guideways m are provided internally on each side of the valve-casing for guiding the valve-disks.

Inputting the valve-disks, the lifting-nut, and the wedge-pieces together for operation the compound wedge-block II isfirst inserted through one of the side openings fof the lifting-nut E, then the nut is turned upon the screw 0, and the retaining nut or collar I is secured to the end of the screw by a pin. The rectangular sideplates G are then inserted in 0 the rectangular openings f of the lifting-nut E and the valve-disks hung by their short journals din the circular openings of such plates, and then the parts thus connected are lowered or set in position in the pipe-section.

5 The top of the valve-casing, with nut I) and 0 Wheel 0 secured to the top of the valve-stem.

housing B in position, can then be secured in place. At any suitable time, either before or after the top of the casingis secured in place, the stuffing-box may be closed and the hand- The operation of the valve is very simple and can be readily effected as follows: hen the valve is raised and it is desired to close it, the valve-stem is turned to the right, there 5 by forcing it downward through nut 19, while at the same time the lifting-nut E is caused to travel downward on the left-hand screwthreaded portion of the stem, effecting a rapid downward motion of the valve-disks. As the valve-disks approach the end of their downin disks willloe tightly closed upon their seats a and make perfectly-tight joints. When it is desired toraise and open the valve and the stem is turned to the left, the lifting-nut E is caused to travel upward on the stem 0, thereby releasing the projecting wedgeshaped flanges g of the rectangular plates G from contact with the wedge-shaped plates 7t of wedge-block I-I, thus relieving the pressure upon the valve-disks, so that they are readily withdrawn from their seats and raised by the continued turning of the valve-stem. valve and its operating parts are very simple and compact in construction and are very quick and effective in operation. The motion of the inclined or wedge-shaped surfaces of the rectangular plate G upon the wedge-plates h of the wedge-block II is quite short, and is therefore quickly effected with very little friction, since the parts are neatly fitted one to the other and require Very little motion to effect a perfect closure of the valve-disks upon their seats.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, 1s

1. In a sliding gate-valve, a hollow liftingnut having side plates, each provided with two inclined lateral flanges, in combination with the valvedisks having short central journals fitting V in the circular openings, a screw, awedge-block for hearing against said lateral flanges, and a nut on the screw for supporting the Wedge-block, the combination ward for holding the valves to their seats, substantially as described.

2. In a sliding gate-valve, a hollow liftingnut having rectangular openings in its sides in connection with rectangular plates fitting in such openings and eachhaving inclined lateral flanges, and a circular opening between such flanges, thevalve-disks having short central journals fitting in the circular openings of the rectangular plates, a screw,and intermediate means connecting with the screw for bearing on said lateral flanges and forcing such rectangular plates outward for holding the valves to their seats, as described.

3. In a sliding gate-valve, a hollow lifting nut connected with and supporting the valvedisks, in combination with a compound wedgeblock fitted in the hollow lifting-nut and having wedge shaped end plates and vertical openings for the va1ve-stem,a retaining nut or collar secured to the valve-stem below the wedge-block, and the Valve-disk having, connected inclined flanges, substantially as de: scribed. j

4. In a sliding gate-valve, a hollow lifting- This,

' permitting the forcing of the side plates out- IIO nutprovided with means for receiving short journals projecting from the backs of the valve-disks,in combination with a compound Wedge-block fitted in the hollow lifting-nut and having wedge-shaped end plates and a vertical opening for the valve-stem,fand a retaining nut or collar secured to the valvestem below the wedge-block, as and for the purpose described.

5. In a sliding-gate-valve, a hollow liftingnut E, having rectangular side openings and the vertical openings, in combination with rectangular plates G, having lateral inclined flanges g and circular openings, the valve disks D, having short journals d fitting in the l circular openings of the plates G, the compound Wedge-block H, having wedge-shaped end pieces h and fitted in the lifting-block E, and a retaining nut or collar secured to the valve-stem below the wedge-block, substantially as described.

In testimony whereof I affix my signature in presence of two Witnesses.

WILLIAM CRIGHTON. Witnesses:

SIDNEY C. LUMBARD, IRVING D. EVANS. 

